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Vitellin is a protein found in the egg yolk.It is a phosphoprotein. [1] Vitellin is a generic name for major of many yolk proteins. [2]Vitellin has been known since the 1900s. [3]
Meaning [1] Latin (or Neo-Latin) origin [1] a.c. before meals: ante cibum a.d., ad, AD right ear auris dextra a.m., am, AM morning: ante meridiem: nocte every night Omne Nocte a.s., as, AS left ear auris sinistra a.u., au, AU both ears together or each ear aures unitas or auris uterque b.d.s, bds, BDS 2 times a day bis die sumendum b.i.d., bid, BID
The vitelline membrane or vitelline envelope is a structure surrounding the outer surface of the plasma membrane of an ovum (the oolemma) or, in some animals (e.g., birds), the extracellular yolk and the oolemma.
Vitellogenin provides the major egg yolk protein that is a source of nutrients during early development of egg-laying vertebrates and invertebrates.Although vitellogenin also carries some lipid for deposition in the yolk, the primary mechanism for deposition of yolk lipid is instead via VLDLs, at least in birds and reptiles. [4]
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In the human embryo, the vitelline duct, also known as the vitellointestinal duct, [1] the yolk stalk, [1] the omphaloenteric duct, [1] or the omphalomesenteric duct, [1] is a long narrow tube that joins the yolk sac to the midgut lumen of the developing fetus. [2]
Summary of the main patterns of yolk accumulation and cleavage in animal embryology (after [6] and [7]).; I. Holoblastic (complete) cleavage II. Meroblastic (incomplete) cleavage
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